JP5835253B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine including a permanent magnet.

  Conventionally, a rotating electrical machine including a permanent magnet is known (see, for example, Patent Document 1).

  In the rotating electrical machine disclosed in Patent Document 1, the number of slots per phase q per pole, which is a value obtained by dividing the number of slots by the number of poles, which is the number of magnetic poles, and the number of voltage phases, is 1 <q ≦ 3. The windings are distributedly distributed in the stator slots so as to satisfy / 2 (coils of each phase and phase are distributed in a plurality of slots). As a result, the distortion of the waveform of the induced voltage can be reduced and the copper loss of the winding can be suppressed from increasing.

Japanese Patent No. 4725684

  In a rotating electrical machine such as Patent Document 1, it is generally known that a harmonic component is included in an induced voltage. Note that the harmonic component means a voltage component having a frequency that is an integral multiple of the basic frequency with respect to the basic frequency. In addition, in a three-phase AC voltage, when each phase winding is Y (star) -connected, harmonic components corresponding to orders of odd multiples of 3 (third order, ninth order,...) Appear. It is known not to. Therefore, fifth-order, seventh-order,... Harmonic components appear. Therefore, it is desired to reduce higher-order harmonics.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a rotating electrical machine capable of reducing higher-order harmonics.

  As a result of intensive studies by the inventors of the present invention to achieve the above object, the slot vector pitch angle of the slot vector, which is the electrical phase of the windings arranged in a plurality of slots, reduces harmonics in a rotating electrical machine. It has been found that the higher-order harmonics are reduced by configuring the slot vector pitch angles between the slot vectors to be unequal pitches.

That is, the rotating electrical machine according to one aspect includes a rotor core provided with a permanent magnet, a stator core arranged in a radial direction to face the rotor core, and provided with a plurality of slots, and a winding arranged in a slot of the stator core. The number of slots per phase per pole q, which is a value obtained by dividing the number of slots Ns by the number P of permanent magnet poles and the number m of voltage phases, is a fraction in which the denominator is odd and the numerator is even. The slot vector, which is the electrical phase of the windings arranged in a plurality of slots , is a 7th order voltage having a frequency 7 times, 11 times and 13 times the fundamental frequency of the voltage induced in the windings. , so as to reduce at least one harmonic of the 11 th and 13 harmonics, as the slot vector pitch angle between each slot vector becomes nonuniform pitch Made which are, in the case where the Ns slots, allocated to a plurality of phase belt, the slot vectors included in one phase belt, the state slot vector pitch angle is equal pitches, included in one phase belt By moving the slot vector clockwise or counterclockwise by a predetermined pitch angle θ _{ie in} a direction approaching the central axis of the group of slot vectors, the slot vector pitch angle between the slot vectors becomes an unequal pitch. It is configured to be.

  In the rotating electrical machine according to one aspect, as described above, the slot vectors are configured such that the slot vector pitch angles between the respective slot vectors are unequal pitches. Thereby, unlike the case where the slot vector pitch angles between the respective slot vectors are equal, higher-order harmonics can be reduced. It should be noted that high-order harmonics can be reduced by configuring the slot vector so that the slot vector pitch angles between the slot vectors are unequal pitches. Confirmed by simulation.

  By configuring as described above, higher-order harmonics can be reduced.

It is a top view of the rotary electric machine by one Embodiment of this invention. 1 is an enlarged plan view of a rotating electrical machine according to an embodiment of the present invention. It is a figure for demonstrating the relationship between the width | variety and pitch of the permanent magnet of the rotary electric machine by one Embodiment of this invention. It is a figure for demonstrating the slot vector of the rotary electric machine by one Embodiment of this invention. It is a top view of the rotary electric machine by a comparative example. It is a figure for demonstrating the slot vector of the rotary electric machine by a comparative example. It is a figure which shows the result of the simulation performed about the relationship between the width | variety of a permanent magnet, and a harmonic component. It is a figure for demonstrating the harmonic component of the rotary electric machine by one Embodiment of this invention, and the rotary electric machine by a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIGS. 1-4, the structure of the rotary electric machine 100 by this embodiment is demonstrated.

  As shown in FIG. 1, the rotating electrical machine 100 includes a stator 1 and a rotor 2. The stator core 11 of the stator 1 is provided with a plurality of (12 in this embodiment) slots 12. That is, in the present embodiment, the number Ns of slots is 12. In FIG. 1, slot numbers # 1 to # 12 are described in 12 slots 12 respectively. Further, teeth 13 are provided between adjacent slots 12.

Here, in this embodiment, as shown in FIGS. 1 and 2, each of the twelve slots 12 is in a state where the mechanical slot pitch angle between the slots 12 is equal (see FIG. 5). From the above, it is moved clockwise or counterclockwise by a predetermined mechanical pitch angle θ _im (in this embodiment, 1.65 degrees), and each slot 12 is moved in a point-symmetric manner. Thus, as shown in FIG. 4, the slot vector pitch angles are configured to be unequal pitches. In other words, the arrangement (position) of the slots 12 is the same even if the slots 12 are rotated 180 degrees around the center point A1 of the slots 12. The slot vector will be described later in detail.

Specifically, the slot 12 of slot number # 1 has a mechanical pitch as shown in FIG. 2 from the state where the mechanical slot pitch angle shown in FIG. 5 is an equal pitch (mechanical slot pitch angle 30 degrees). It is moved clockwise by an angle θ _im (in this embodiment, 1.65 degrees). Further, the slot 12 with the slot number # 2 is moved counterclockwise by the mechanical pitch angle θ _im from the state where the mechanical slot pitch angle shown in FIG. 5 is equal. Further, the slot 12 with the slot number # 3 is moved clockwise from the state where the mechanical slot pitch angle shown in FIG. 5 is equal to the mechanical pitch angle θ _im as shown in FIG. Yes. That is, the mechanical slot pitch angle between the slot 12 with slot number # 1 and the slot 12 with slot number # 2 (= 26.7 degrees = mechanical slot pitch angle when equal pitch is 30 degrees−1.65. The mechanical slot pitch angle between the slot 12 with slot number # 2 and the slot 12 with slot number # 3 (= 33.3 degrees = equal pitch). Angle 30 degrees + 1.65 degrees + 1.65 degrees).

Similarly, from the state in which the slot numbers # 5, # 7, # 9 and # 11 (odd number) slots 12 have the same mechanical slot pitch angle shown in FIG. 5, as shown in FIG. _Is moved clockwise by the _target pitch angle θ _im . In addition, as shown in FIG. 1, the slots 12 with slot numbers # 4, # 6, # 8, # 10 and # 12 (even numbers) are in a state where the mechanical slot pitch angles shown in FIG. The counter is moved counterclockwise by the mechanical pitch angle θ _im .

  A winding 14 is disposed (winded) in the slot 12. In the present embodiment, the number of phases m of the voltage induced in the winding 14 is 3 (U phase, V phase, and W phase). Further, the winding 14 is wound around the slot 12 by concentrated winding so that the number q of slots per phase per pole, which will be described later, is a fraction that satisfies 1/4 <q <1/2. Specifically, the winding 14 is intensively wound around one tooth 13. For example, a U-phase winding 14 (winding 14a indicated by rough hatching) is wound around a tooth 13 between slot numbers # 1 and # 2. Similarly, a U-phase winding 14 is wound around teeth 13 between slot numbers # 6 and # 7, between slot numbers # 7 and # 8, and between slot numbers # 12 and # 1.

  In addition, a V-phase winding is formed on the teeth 13 between the slot numbers # 2 and # 3, between the slot numbers # 3 and # 4, between the slot numbers # 8 and # 9, and between the slot numbers # 9 and # 10. 14 (winding 14b shown without hatching) is concentrated.

  Also, a W-phase winding is formed on the teeth 13 between the slot numbers # 4 and # 5, between the slot numbers # 5 and # 6, between the slot numbers # 10 and # 11, and between the slot numbers # 11 and # 12. 14 (winding 14c shown by fine hatching) is concentratedly wound.

  A plurality (10 in this embodiment) of permanent magnets 22 are provided on the outer peripheral portion of the rotor core 21 of the rotor 2. That is, in this embodiment, the number of poles P is 10.

  Here, in this embodiment, the number of slots 12 per phase, which is a value obtained by dividing the number Ns of slots 12 by the number of poles P of the permanent magnet 22 and the number of voltage phases m, has an odd denominator, It is configured so that the numerator is an even fraction. Specifically, as described above, the number of slots per phase per pole q (= Ns / (m × P)) is configured to be 2/5 (= 12 / (3 × 10)). . When the voltage phase number m is 3, the numerator (slot number Ns) of the number of slots per phase per pole is always a multiple of 3, and a balanced winding cannot be realized. The denominator is preferably an odd number that is not a multiple of 3.

  In the present embodiment, as shown in FIG. 3, the width W (width W in the direction along the circumferential direction) of the permanent magnet 22 is equal to the pitch p (pitch p along the circumferential direction) of the adjacent permanent magnet 22. The size is 4/5 or more and 6/7 or less. Specifically, the width W of the permanent magnet 22 is configured to be 4/5 of the pitch p of the adjacent permanent magnets 22. It should be noted that by adjusting the width W of the permanent magnet 22, it is possible to reduce the desired order of harmonics. The relationship between the width W of the permanent magnet 22 and the harmonic component will be described in detail later.

  In addition, the permanent magnet 22 has a tapered shape that gradually decreases in width toward the outer peripheral side of the rotor 2 when viewed from the axial direction. Further, the radius of curvature of the inner circumference side of the permanent magnet 22 is substantially equal to the radius of curvature of the outer circumference of the rotor core 21. Further, the radius of curvature on the outer peripheral side of the permanent magnet 22 is substantially equal to the radius of curvature of the inner periphery of the stator core 11. Thereby, the distribution shape of the magnetic flux of the permanent magnet 22 becomes a substantially rectangular shape (rectangular wave). On the other hand, when the curvature radius on the outer peripheral side of the permanent magnet 204 is smaller than the curvature radius on the inner periphery of the stator core 11 (bow shape) as in the rotating electric machine 200 according to the comparative example shown in FIG. Since the thickness t2 of the end portion of the first electrode becomes small, there is a possibility of demagnetization. For this reason, in the bow-shaped permanent magnet 204 (for example, Nd—Fe—B magnet), an additive of a rare heavy rare earth such as dysprosium (Dy) or terbium (Tb) is used in order to increase the holding force (Hcj). Need to add. Further, in the arc-shaped permanent magnet 204, the volume of the permanent magnet 204 is reduced, and accordingly, the torque of the rotating electrical machine 200 is reduced accordingly. On the other hand, in the permanent magnet 22 (see FIG. 3) of the present embodiment, the thickness t1 of the end in the circumferential direction is larger than that of the bow-shaped permanent magnet 204, so that demagnetization can be reduced and the permanent magnet. Since the volume of 22 becomes large, the torque of the rotating electrical machine 100 can be increased.

  Next, referring to FIG. 4, the relationship between the position (slot number) of the winding 14 of each phase (U phase, V phase, W phase) and the electrical phase is shown in FIG. 5 and FIG. A description will be given in comparison with a rotating electrical machine 200 according to a comparative example in which the general slot pitch angle (slot vector pitch angle) is equal.

  As shown in FIG. 5, in the rotating electrical machine 200, twelve slots 202 arranged in the stator 201 are arranged at equal pitch intervals. That is, the mechanical slot pitch angle of the slot 202 is 30 degrees (= 2π / Ns = 360/12). In this case, as shown in FIG. 6, the slot vector, which is the magnetomotive force (Amper Turn) (electrical phase) generated by the winding 203 arranged in each slot 202, is the slot vector pitch between the slot vectors. The corners become equal pitch. The electrical slot pitch angle of the rotating electric machine 200 is 150 degrees (= π × P / Ns = 180 × 10/12). The slot vector pitch angle is 30 degrees (= 360/12).

Here, in the present embodiment, each of the twelve slots 12 is configured such that the mechanical slot pitch angle between the slots 12 is an unequal pitch (see FIG. 1), whereby the rotating electrical machine 100 is configured. Then, as shown in FIG. 4, a slot vector which is a magnetomotive force (Amper Turn) generated by the windings 14 arranged in a plurality of (in this embodiment, twelve) slots 12 is between each slot vector. The slot vector pitch angle becomes unequal pitch. Note that unequal pitch means that the pitch is not equal. Specifically, each slot vector (# 1 to # 12) is changed from a state in which the slot vector pitch angles between the slot vectors are equal (see FIG. 6) to a predetermined pitch angle θ _ie (this In an embodiment, the slot vector pitch between each slot vector is moved clockwise or counterclockwise by 8.25 degrees and moved so that each slot vector is point-symmetric. The corners are unequal pitches. That is, the arrangement (position) of the slot vectors is the same even if the slot vector is rotated 180 degrees around the center point A2 of the slot vectors.

More specifically, first, as shown in FIG. 6, twelve slots 12 (slot vectors) are divided into a U phase, a U ^* phase in which the direction of current flow is opposite to the U phase, a V phase, The V phase is assigned to six phase bands, ie, the V ^* phase in which the current flowing direction is opposite, the W phase, and the W ^* phase in which the W phase and the current flowing direction are opposite. Then, the slot vectors included in one phase band (for example, the slot vectors # 1 and # 6 included in the U phase band) are changed from the state in which the slot vector pitch angles are equal (see FIG. 6) to FIG. As shown in FIG. 4, by moving the slot vector clockwise or counterclockwise by a predetermined pitch angle θ _{ie with} respect to the central axis C of the group of slot vectors included in one phase band, The slot vector pitch angles between them are configured to be unequal pitches. Specifically, a slot vector included in one phase band (for example, # 1 and # 6 slot vectors included in the U phase band) is changed from a state where the slot vector pitch angles are equal pitches (FIG. 6). Clockwise (slot vector of # 1) or counterclockwise (slot vector of # 6) by a predetermined pitch angle θ _{ie in} a direction approaching the central axis C of the group of slot vectors included in one phase band By moving, the slot vector pitch angles between the slot vectors are configured to be unequal pitches. Note that the mechanical pitch angle θ _im (= 1.65 degrees) and the pitch angle θ _ie (= 8.25 degrees) are θ _im = θ _ie / (number of pole pairs: 10 poles in the present embodiment). / 2 = 5).

  That is, between slot vectors of # 1 and # 6, between slot vectors of # 11 and # 4, between slot vectors of # 9 and # 2, between slot vectors of # 7 and # 12, and slot vectors of # 5 and # 10 Slot vector pitch angle between slot vectors of # 3 and # 8 (= 13.5 degrees = slot vector pitch angle in the case of equal pitch 30 degrees−8.25 degrees−8.25 degrees) is # 6 and Between slot vectors of # 11, between slot vectors of # 4 and # 9, between slot vectors of # 2 and # 7, between slot vectors of # 12 and # 5, between slot vectors of # 10 and # 3, # 8 and Slot vector pitch angle between slot vectors of # 1 (= 46.5 degrees = slot vector pitch angle in case of equal pitch + 8.25 Tasu8.25 degrees) smaller than.

  Next, with reference to FIG. 7, the result of the simulation performed on the relationship between the width W of the permanent magnet 22 and the harmonic component (electromotive force coefficient Kφ) will be described. In FIG. 7, the horizontal axis indicates the ratio (W / p) between the width W of the permanent magnet 22 and the pitch p of the adjacent permanent magnet 22. The vertical axis represents the harmonic component (electromotive force coefficient Kφ).

  As shown in FIG. 7, in the fundamental wave (primary), Kφ gradually increases as the ratio (W / p) between the width W of the permanent magnet 22 and the pitch p of the adjacent permanent magnet 22 increases. It was confirmed. In addition, harmonic components corresponding to even orders do not appear. In addition, it was confirmed that the harmonic component (Kφ) gradually increases as the ratio (W / p) increases in the third harmonic. In the case of three-phase AC voltage, when each phase winding is Y (star) -connected, the third-order harmonic component and the third-order odd number (9th, 15th,...) Harmonic components are canceled out.

  In the fifth-order harmonic, Kφ gradually increases as the ratio (W / p) increases, and when the ratio (W / p) is 0.8 (= 4/5) It was confirmed that the wave component (Kφ) was substantially zero. In the seventh harmonic, when the ratio (W / p) is increased, Kφ is gradually increased, and the ratio (W / p) is about 0.86 (= 6/7). It was confirmed that the harmonic component (Kφ) was substantially zero. That is, when the fifth-order harmonic component is mainly reduced, the width W of the permanent magnet 22 is a value close to 4/5 within the range of 4/5 to 6/7 of the pitch p of the permanent magnet 22. When the 7th-order harmonic component is mainly reduced, the width W of the permanent magnet 22 is set to 6/7 within the range of 4/5 to 6/7 of the pitch p of the permanent magnet 22. It was confirmed that it is preferable to set the value close. Further, if the width W of the permanent magnet 22 is set to an intermediate value between 4/5 and 6/7 (for example, W = 29/35), the fifth and seventh harmonics can be reduced evenly. It was confirmed that

  In addition, as described above, the ninth-order harmonic is canceled out by the three-phase AC voltage when the winding of each phase is Y-connected. In the 11th-order harmonic, the ratio (W / p) gradually increases from the point of about 0.8 after Kφ gradually decreases as the ratio (W / p) increases. Was confirmed. In the 13th-order harmonic, as the ratio (W / p) increases, Kφ gradually increases, and then the ratio (W / p) gradually decreases from the point of about 0.75, It was confirmed that the ratio (W / p) was substantially zero when the ratio was 0.8. After that, in the 13th harmonic, as the ratio (W / p) increases, Kφ gradually decreases and then the ratio (W / p) gradually increases from the point of about 0.85. Was confirmed.

Next, with reference to FIG. 8, the predetermined pitch angle θ _ie found out as a result of the inventor's extensive studies will be described in detail. FIG. 8 shows a rotating electrical machine 200 (see FIG. 5) whose mechanical slot pitch angle (slot vector pitch angle) is equal pitch, and a book whose mechanical slot pitch angle (slot vector pitch angle) is unequal pitch. The counter electromotive force coefficient (Ke) of the rotating electrical machine 100 (see FIG. 1) of the embodiment is shown. That is, FIG. 8 shows that the ratio (W / p) between the width W of the permanent magnet 22 and the pitch p of the adjacent permanent magnet 22 is 0.8 (= 4/5), and the slot vectors are in an equal pitch state. The results are shown for the rotating electrical machine 100 moved clockwise or counterclockwise by 8.25 degrees (pitch angle θ _ie ) (see FIG. 4).

  As shown in FIG. 8, the harmonic components (back electromotive force coefficient (Ke)) of the fundamental wave (primary) of rotating electric machine 200 (equal pitch) and rotating electric machine 100 (unequal pitch) are 1.130, respectively. And 1.118. Further, the third-order harmonic component (Ke) is not zero. On the other hand, when the three-phase AC voltage is Y (star) connection as described above, the third-order odd multiple is used. The harmonic components (Ke) of (3rd order, 9th order, 15th order,...) Are canceled out. Further, when the ratio (W / p) between the width W of the permanent magnet 22 and the pitch p of the adjacent permanent magnet 22 is set to 0.8 (= 4/5), the fifth harmonic component (Ke). Turned out to be zero.

  In addition, the seventh harmonic components (Ke) of the rotating electrical machine 200 and the rotating electrical machine 100 are −0.007 and −0.004, respectively, and the rotating electrical machine 100 (unequal pitch) of the present embodiment is better. It was found to be about 40% smaller. Further, the ninth-order harmonic component (Ke) is not zero, while the ninth-order harmonic component (Ke) is canceled as described above. Moreover, the 11th-order harmonic components (Ke) of the rotating electrical machine 200 and the rotating electrical machine 100 are −0.103 and 0.001, respectively, and the rotating electrical machine 100 (unequal pitch) of the present embodiment is It was found to be about 99% smaller. Further, the 13th harmonic components (Ke) of the rotating electrical machine 200 and the rotating electrical machine 100 are −0.054 and 0.016, respectively, and the rotating electrical machine 100 (unequal pitch) of the present embodiment is It was found to be about 70% smaller. That is, it was confirmed that the seventh-order, eleventh-order, and thirteenth-order harmonic components (Ke) are reduced by setting the mechanical slot pitch angle (slot vector pitch angle) to unequal pitches.

  In the present embodiment, as described above, the slot vectors are configured so that the slot vector pitch angles between the respective slot vectors are not equal pitches. Thereby, unlike the case where the slot vector pitch angles between the respective slot vectors are equal, higher-order harmonics can be reduced.

  Further, the number of slots per phase per pole q is a fraction in which the denominator is an odd number and the numerator is an even number. Thereby, since the numerator of the number of slots per phase per pole q is an even number, the number of slot vectors is an even number. As a result, unlike the case where the number of slot vectors is an odd number, the slot vectors can be arranged symmetrically even when the slot vector pitch angle is moved from the equal pitch state to the unequal pitch state.

In the present embodiment, as described above, each slot vector is rotated clockwise or counterclockwise by a predetermined pitch angle θ _ie from a state in which the slot vector pitch angles between the slot vectors are equal. The slot vector pitch angle between each slot vector is configured to be an unequal pitch by moving clockwise and moving each slot vector to be point-symmetric. Thus, even when the slot vector pitch angles are unequal, each slot vector is arranged point-symmetrically. Therefore, unlike the case where each slot vector is not arranged point-symmetrically, the rotating electrical machine 100 (rotor 2 ) Can be rotated in a balanced manner.

In the present embodiment, as described above, the number m of induced voltages is three phases of the U phase, the V phase, and the W phase, and the Ns slots 12 are divided into the U phase, the U phase, and U ^* phase the current flowing direction is reversed, and the V-phase, and V ^* phase the flow direction of the V-phase and the current is reversed, the W-phase, the direction of flow of the W-phase current is reversed W ^* Assign to 6 phase zones with phases. Then, a slot vector included in one phase band is changed from a state where the slot vector pitch angle is equal to a predetermined pitch angle θ _{ie with} respect to the central axis C of the group of slot vectors included in one phase band. By moving clockwise or counterclockwise by the amount, the slot vector pitch angles between the respective slot vectors are configured to be unequal pitches. Thus, in each phase band, the slot vector pitch angles become unequal pitches, so that only the slot vector pitch angles of some of the three phases are made unequal pitches. The rotor 2) can be rotated with good balance.

In the present embodiment, as described above, the slot vector included in one phase band is changed from the state in which the slot vector pitch angle is equal to the central axis C of the group of slot vectors included in one phase band. _Is moved clockwise or counterclockwise by a predetermined pitch angle θ _ie so that the slot vector pitch angles between the slot vectors become unequal pitches. As a result, the slot vectors included in each phase band are similarly moved, so that each slot vector can be easily arranged point-symmetrically.

Further, in the present embodiment, as described above, each of the plurality of slots 12 is changed by a predetermined mechanical pitch angle θ _im from a state where the mechanical slot pitch angle between the slots 12 is equal. The slot vector pitch angles are configured to be unequal pitches by moving clockwise or counterclockwise and moving each slot 12 to be point-symmetric. Thereby, since the pitch between the windings 14 arranged in each slot 12 becomes an unequal pitch, the slot vector pitch angle can be easily changed to an unequal pitch.

  In the present embodiment, as described above, the winding 14 is wound around the slot 12 by concentrated winding so that the number of slots per phase q is a fraction satisfying 1/4 <q <1/2. Turn. Here, in the rotating electrical machine 100 in which the winding 14 is wound around the slot 12 by concentrated winding, cogging due to harmonics is likely to occur. In this case, by making the slot vector pitch angle an unequal pitch. Thus, cogging caused by harmonics can be easily reduced.

  In the present embodiment, as described above, the width W of the permanent magnet 22 is configured to be 4/5 of the pitch p of the adjacent permanent magnets 22. Thereby, the fifth-order harmonic component can be reliably reduced.

  Further, in the present embodiment, as described above, the number q of slots per phase per pole is configured to be 2/5. Thereby, in the concentrated winding rotating electrical machine 100 in which the number q of slots per phase per pole is 2/5, harmonics can be easily reduced.

  In the present embodiment, as described above, the number m of induced voltages is set to three phases, the number Ns of slots 12 is set to 12, and the number of poles P is set to 10. Thereby, the number of slots per phase per pole q (= 2/5) can be easily made a fraction with an odd denominator and an even numerator.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example of a concentrated winding rotating electrical machine in which the number of slots per phase per pole q is 2/5 is shown, but the number of slots per pole per phase q is 2/7, 4/11, 6/13, 8/17 /, 10/21... In addition, the number of slots per phase per pole q is 4/5, 6/5, 8/5, 12/5, 14/5... With a denominator of 5, and 4/7, 6 / with a denominator of 7. 7, 8/7, 10/7 ..., 6/11, 8/11, 10/11, 12/11 ... with denominator of 11, 8/13, 10/13 with denominator of 13, 12/13, 14/13..., Denominator is 10/17, 12/17, 14/17, 16/17, 18/17, 20/17,. A distributed winding electric machine such as / 21,.

In the above embodiment, the slot vector is moved clockwise or counterclockwise by a predetermined pitch angle of 8.25 degrees from the state where the slot vector pitch angle is equal pitch. If the wave component can be reduced, the slot vector may be moved clockwise or counterclockwise by an angle other than 8.25 degrees. The predetermined pitch angle θ _ie to which the slot vector is moved is less than ½ of the angle when the slot vector pitch angle is equal.

Further, in the above embodiment, the slot is moved clockwise or counterclockwise by a predetermined mechanical pitch angle θ _im from a state where the mechanical slot pitch angle between the slots is equal. Although the example in which the vector pitch angle is made unequal is shown, the slot vector pitch angle may be made unequal by a method other than the method in which the mechanical slot pitch angle is made unequal.

  In the above-described embodiment, the example in which the number of phases of the induced voltage is 3 has been described, but the number of phases of the induced voltage may be other than 3.

  In the present embodiment, the example in which the width of the permanent magnet is set to 4/5 of the pitch p of the adjacent permanent magnet is shown. However, the width of the permanent magnet is set to 4/5 or more of the pitch p of the adjacent permanent magnet. It may be set within a range of / 7 or less.

11 Stator Core 12 Slot 14 Winding 21 Rotor Core 22 Permanent Magnet 100 Rotating Electric Machine

Claims (9)

A rotor core provided with a permanent magnet;
A stator core disposed in a radial direction opposite to the rotor core and provided with a plurality of slots;
A winding disposed in a slot of the stator core,
The number of slots per pole, q, which is a value obtained by dividing the number of slots Ns by the number of poles P of the permanent magnet and the number of phases of voltage m, is a fraction in which the denominator is odd and the numerator is even. ,
The slot vector, which is the electrical phase of the windings arranged in the plurality of slots, is a voltage having a frequency 7 times, 11 times, and 13 times the fundamental frequency of the voltage induced in the winding 7 next, so as to reduce at least one harmonic of the 11 th and 13 harmonics, slot vector pitch angle between each slot vectors are configured to be unequal pitch,
When the Ns slots are assigned to a plurality of phase bands, a slot vector included in one phase band is changed to a slot vector included in the one phase band from a state where the slot vector pitch angles are equal. By moving clockwise or counterclockwise by the predetermined pitch angle θ _{ie in} the direction approaching the central axis of the group of vectors, slot vector pitch angles between the respective slot vectors become unequal pitches. An electric rotating machine configured to be . Each slot vector is moved clockwise or counterclockwise by a predetermined pitch angle θ _ie from a state in which slot vector pitch angles between the respective slot vectors are equal pitches, and The rotating electrical machine according to claim 1, wherein the slot vector pitch angles between the respective slot vectors are set to be unequal pitches by moving the slot vectors so as to be point-symmetric. The phase number m of the induced voltage is three phases of U phase, V phase and W phase,
The Ns slots are divided into a U phase, a U ^* phase in which the direction of current flow is opposite to that of the U phase, a V phase, a V ^* phase in which the direction of current flow is opposite to that of the V phase, and a W phase. When the slot vectors included in one phase band are assigned to the six phase bands of the W phase and the W ^* phase in which the direction of current flow is opposite, the slot vector pitch angles are equal to each other. Slots between the respective slot vectors are moved clockwise or counterclockwise by the predetermined pitch angle θ _{ie with} respect to the central axis of the group of slot vectors included in one phase band. The rotating electrical machine according to claim 2, wherein the vector pitch angles are configured to be unequal pitches. Each of the plurality of slots is moved clockwise or counterclockwise by a predetermined mechanical pitch angle θ _im from a state in which mechanical slot pitch angles between the slots are equal, and The rotation according to any one of claims 1 to 3 , wherein the slot vector pitch angles are configured to be unequal pitches by moving the slots so as to be point-symmetric. Electric. Wherein each each pole phase slot number q is such that the fraction that satisfies 1/4 <q <1/2, the winding is wound by concentrated winding in said slot, according to claim 1-4 The rotating electrical machine according to any one of claims. A plurality of the permanent magnets are provided on the outer periphery of the rotor core,
The width of the permanent magnet is configured to be 4/5 or more 6/7 or less of the size of the pitch of adjacent permanent magnets, the rotating electric machine according to any one of claims 1-5. The rotating electrical machine according to claim 6 , wherein the width of the permanent magnet is configured to be 4/5 the pitch of adjacent permanent magnets. Wherein each each pole phase slot number q is 2/5 is configured to be rotary electric machine according to any one of claims 1-7. The rotating electrical machine according to claim 8 , wherein the number of phases m of the induced voltage is three phases, the number of slots Ns is 12, and the number of poles P is 10.

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